Braking device



G, s. mcKuM.

v BRAKI-NG DEVICE.

APPLICATION FILED 1UNE20| I92I l ,433,220, Patented Oct. 24, 1922.

, thereto Patentes @ce i922.

Banniere nnvron.

Application filed June 2G,

in@ is a saeciiic-ation.

This invention relates to means tor braking; `motor vehicles, or other machines7 and the main obj ect ot the invention is to provide improved means for controllably arresting the movement oi the vehicle7 or machine.Il 'in one direction While permitting it to move in the opposite direction.

A i'i'irther object of the invention. is to provide means for the said purpose Which will perm-it of the braking action being applied insuch manneras to arrest the movement of the machine or simply to retard the same.

'The accompanying drawings illustrate an embodiment ot my invention, and referring' Fig; 1 is a side elevation or" the braking device, partly in section;

Fig. E2 is a section on line 2 2 in Figi;

Fig. 3 is a detailed section of a braking dog.

ln the drawings my invention is shown as applied to an axle l of a motor truck, or other vehicle, 2 indicating a portion of the trame or chassis ot said vehicle on which said axle is mounted in the usual bearings. A cylindrical sleeve 3 is rigidly connected to Wheel 2O mounted on said axle and is adapted to engage on its peripheral surface `with the braking` devices hereinafter described. Said braking devices are mounted within a cylindrical casing comprising a ringl l and end plates 33 and 34. Said ring 4 is provided with inwardly extending anges or rings 5 rigidly secured thereto and to each other, said flanges or rings being formed vvith a cylindrical bore 6 fitting` on the sleeve `3 aforesaid and provided With cylindrical recesses 7 extending outwardly fromfsaid bore and adapted to receive the braking` devices 8. Each braking dog 8 is formed as a cylinder fitting in the corresponding recess 7 and cut avvay at the side adjacent to the sleeve 3 and is provided at said cut away portion With a rib 9 and a recess 10 on each side of said rib, said recess being deepest adjacent to said rib and the bottom of said. recess sloping toward the Asleeve 3 as it recedes from said rib, so as to i921. se anni. Maase.

ing` tace 11 to produce a ivedging action as hereinafter set. forth. A helical sprintf 12 is mounted in a recess 13 in rib 9 and roiiers le are provided in the respective recesses 10 and are engaged by said spring to torce said rollers apart. 'llhe dog S may be of the same length as the thickness ot the tvvo ring inembers 5 and the rollers'lfi preteraliily extend beyond said dog at each end so as to project into slots l5 in rings 16 which are secured to the rings 5 aforesaid, so as to retain said rollers in proper radial position, said slot 15 being', however, of such dimensions as to permit the movement oia the rollers necessary for the v'edging and releasing lactions hereinafter i terred to. Each dog 8 is further provided .vith lugs 17 tor engaging an eccentric 18 mounted on a vpin or shaft 19 so as to cause the dog to le turned one Way or the other by partial rotation of said shaft or pin. The several shafts or pins 19 are connected to move in unison by means of an operating ring 2O pivotally engaging pins 21 on the arms 22 carried by `the respective shafts or pins 19. Said operating ring` 20 is operated by an arm 2d pivotally engaging` therewith by pin 25, said arm being` carried by a shaft 26 mounted in the rings 5 aforesaid and connected to a controlling lever to control the operation of the brake. For example, said shaft 26 may carry an arm connected by rod 29 to a lever 30 mounted on the frame or body of the car' in any suitablemanner and having` an operating handle 31 and locking means 32 whereby it may be locked in neutral. torivard brake or reverse brake position.

The operation is as follows:

In normal or released position as shoivn in Fig. 1, the operating1 lever 30 is so placed that through the members Q9) 22 26, 9A: and 2() itholds the shafts 19 in position to mairitain the dogs 8 withv their recesses 10 symmetrically placed with reference to the braking sleeve 8. In this position the Wedging: 'faces of the recesses 10 extend substantially parallel to the periphery of the bralfingr sleeve 3 so that there is no ,dripping action in either direction ot the rotative movement of the sleeve 3 vfitliinthe doggins devices. Assuming that the vehicle is standing on a grade or hill-side facing unhill and that it is desired to prevent downward movement ot the vehicle While permitting; its free upward movement7 the lever 30 may l e operated so to act through the aforo mei'itioned parts to bring dogs 8 to the position shown in il: 3, the shafts it), operating; through the eccentrics 18, engaging the lues l? on each deg 8 to turn said dopoy slightljv ivishin the cylindrical recess 6 so as to cause the ivedgiug face 'il of the recess l0 on one side of said dog to move toward the niemeer 2l While the corresponding Wcdpging face on the other side moves away from said member 3. rlhe result of this operation is that the side thatis moved. toward the member B presents runway for the p rippine' rollers "lllwhich tapers or con- 4 tlc direction of motion of the siee e il, in case the vehicle starts to move bac -ardlvn so that such motion of 'the sleeve 3 ivill roll the rollers ielwithin this converging runway and cause it to be ajripped between the sleeve P and the 'Wedging face ll aforesaid. rl`he spring;` l2 serves to ens re initial engagement of the roller with these lgripping faces. lllhile rearward movement of the vehicle is therebiv prevent- 'ed it is possible to start up the vehicle Witliout resistance from the brake, the l ipping devices above described instantly'releasingr on forward. movement of the vehicle.

in case it is desired to arrest or re ard the forward movement of the vehicle the lever il() moved in the opposite directiom to tip or turn the dog` .8 reverscly and cause hem to grip in the forward motion ofthe sleeve 3. This gripping or bralf' if action maybe varied by varying; the ement of motion of the controlling lever 30 so as to turnthe dogs 8 to a greater or less extent and correspondingly increase or diminish the gripping;l action on the rollers ld on the advance side of the dog.

lt. is to be understood that the casingor housing` l will be mounted on or connicted with any suitable supporting means, for exainpic,ftlie differential or rear axle housing;y so as to prevent the same from turning, and the connection betiveen the lever 3() and the lever 28 will be such as to permit of the usual vertical n'iovcment of the chassis relative to'said housing.`

My invention is also applicable to the braking of other machines, .for example, lio ts, or stationary engines7 in Which it is desired to arrest or retard the movement of the rotative shaft or member.

Ti/Vhat l claim is: 1 l. A braking device comprising a rota-- tive braking member provided With a cylindrical surface, means extending around said braking member and providedv with dogs rotatively mounted therein, said dogs hav ingrecesses foi-ined 'with Wedging faces op posing` the cylindrical surface of said braking member, means for effecting partial rotation of said dogs to cause said Wedging face thereof at one side of the dogs to approach said cylindrical surface and the casing` 'extending around said cylindrical member and provided internally with cylindrical recesses forming bearings, dogs havingl cylindrical surfaces engaging said recesses to rotatably support said dogs each dog being` provided with tivo roller receiving recesses having," Wedging faces, rollmounted in 'the respective recesses Vand adapted to be gripped between said Wedg ingr faces and the cylindrical brake member and operating means for imparting partial rotation to said dogs to cause the ivedging face at one side of said dog to' approach said cylindrical brake member to grip the roller at that side and the uf'edging; face at the opposite side of each dog to recede from the cylindrical brake member to release the roller at that side.

8. Braking means7 as set forth in claim f2, in which said operating means for the dogs comprises a plurality` of shafts inneccentrics enge (Ying said dogs to re turn the saine, said sha. s havingi operatingl arms, a ring pivotally connected to said operatinu` arms, a piro-tally .mounted arm connected to operaie ring; and a lever conl neeted to operate the last named arm and provided with means ljor locking it in normal position and in position at either side of said normall osition for causinf the o aerae, l l

tion of the braking;` means in either forward or reverse movement of said rotatably mounted cylindrical brake member."

In testimony whereof I have hereunto subscribed my name thisplOt-h day of June G-ERGE S. NICKUM,

lilitiiesses: i f n i WmLnii-.r A. Cross,

R. l?. KITTERMAN. 

